107 results about "Intergranular corrosion" patented technology

The invention relates to the technical field of pressure vessel health monitoring and nondestructive testing, in particular to an electromagnetic acoustic surface wave-based pressure vessel intergranular corrosion non-contact detection system, which comprises the following modules: a multi-field coupling electromagnetic acoustic surface wave detection module, which comprises a plurality of detection unit arrays, each detection unit comprises a magnetic biasing module and an impedance matching module and is used for generating a local magnetic field on the surface of the pressure vessel and optimizing signal excitation and receiving; and the signal acquisition and preprocessing module is used for acquiring the surface wave signal of the detection module and carrying out denoising, filtering, curved surface coupling difference correction and lift-off correction on the signal to obtain high-quality signal data. According to the method, non-contact quantitative detection of the intergranular corrosion of the pressure vessel is realized through multi-field coupling electromagnetic acoustic surface wave detection and microscopic and macroscopic mapping and inversion, so that the problem that early corrosion is difficult to quantify due to the fact that contact ultrasound is mostly adopted in traditional pressure vessel detection and grain boundary micro-damage cannot be effectively identified is solved.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The application discloses an intermediate processing liquid for an electroless nickel immersion gold (ENIG) production line and a chemical gold preparation method. The intermediate processing liquid is applied between the electroless nickel plating and immersion gold processes, and comprises (a) a pH buffer and a metal ion complexing agent: a total concentration of 50-150 g / L; (b) an adsorptive corrosion inhibitor: a concentration of 0.5-5.0 g / L; (c) a low-foam non-ionic surfactant: a concentration of 0.01-10 g / L; (d) an auxiliary antioxidant: a concentration of 0.5-30 g / L; (e) a dissolving agent: a concentration of 1-50 ml / L; (f) a pH regulator: an appropriate amount, which is added to maintain the pH value of the intermediate processing liquid at 4.0-6.5; and (g) deionized water: a balance, so that the concentrations of the above components reach the set target values; and the intermediate processing liquid has a design use temperature of 20-45 DEG C. The intermediate processing liquid removes residual nickel ions on the board surface and in micropores through strong complex cleaning, and blocks the pollution to the subsequent gold tank; meanwhile, the preferential adsorption of the corrosion inhibitor molecules at the nickel layer grain boundaries forms a controllable molecular-level protective film, effectively adjusts the immersion gold replacement reaction kinetics, and prevents the occurrence of intergranular corrosion (black plate).

The invention relates to a method and a product for regenerating and repairing duplex stainless steel, the duplex stainless steel is used for a nuclear-grade main pipeline, pulse current with optimized parameters is adopted to treat the duplex stainless steel in the nuclear-grade main pipeline with pitting corrosion or intergranular corrosion generated in the service process, the corrosion resistance of the duplex stainless steel is recovered, and dynamic self-repairing of a passive film is achieved. According to the method, pulse current in-situ / near-in-situ treatment is carried out on the duplex stainless steel for the nuclear-grade main pipeline under the electric-thermal coupling condition, components do not need to be disassembled or large-volume furnace heating does not need to be carried out, and the structure and geometric accuracy of a casting are not changed; by selecting matched parameters such as pulse frequency, pulse width, current density and treatment time, an amplitude-modulated decomposed structure in a ferrite phase and a phase interface precipitated phase are promoted to be re-dissolved, the formation dynamics and stability of a passive film are improved, and the corrosion resistance and toughness of an aged material are recovered or close to an unaged state.

The invention relates to the technical field of laser welding, in particular to a water curtain cooling stainless steel pipe intelligent laser welding device which comprises a machine body, and a welding mechanism is arranged on the machine body and used for stainless steel pipe welding machining. The water curtain assembly comprises a lower ring frame fixed to the outer wall of the lower end of the laser welding device, L-shaped supports are pivoted to the outer walls of the left end and the right end of the lower ring frame, round sleeves are fixed to the outer ends of the L-shaped supports, nozzles are installed in the round sleeves in a penetrating mode, an upper ring frame is fixed to the outer wall of the upper end of the laser welding device, and first air cylinders are pivoted to the outer walls of the left end and the right end of the upper ring frame. The lower output end of the first cylinder is pivoted with the upper end of the L-shaped bracket; the welding seam is precisely covered and rapidly cooled through the dynamically adjusted flat water curtain, the intergranular corrosion tendency is remarkably restrained, welding deformation is reduced, meanwhile, air is isolated to improve surface oxidation, and the corrosion resistance, the size precision and the appearance quality of a connector are comprehensively improved.

The invention relates to the technical field of pressure vessel intergranular corrosion detection, in particular to a nonlinear ultrasonic guided wave detection method for pressure vessel intergranular corrosion. The system comprises a signal generation and emission module, a signal acquisition and preprocessing module, a feature extraction and analysis module, a damage positioning and evaluation module, an optimization and calibration module and a data storage and visualization module. According to the invention, through cooperative work of the multi-band excitation signal and the distributed sensor array, the detection sensitivity and resolution are significantly improved; a nonlinear characteristic matrix and a multi-level decomposition capture material nonlinear effect are utilized to realize accurate positioning and evaluation; an adaptive parameter adjustment mechanism simplifies the operation process and reduces the detection cost; and a cloud database and a graphical interface are convenient for result storage and analysis. The intergranular corrosion can be efficiently and reliably detected, and a scientific basis is provided for the industrial field.

The utility model discloses a kind of grinding devices of electrostatic contact, belong to grinding processing equipment technical field, the grinding device includes the clamping assembly for clamping electrostatic contact, first station is equipped on clamping assembly, hot shrink tube is placed on first station, hot shrink tube is inserted for the clamping part of electrostatic contact, air gun assembly is equipped on clamping assembly, air gun assembly can spray high-temperature hot gas, when clamping assembly moves to the clamping part of electrostatic contact, air gun assembly is spirally rotated with hot shrink tube as center, so that hot shrink tube is heat-shrunk and tightened and the clamping part of electrostatic contact is connected, to when clamping assembly clamps the clamping part of electrostatic contact, clamping assembly is clamped on heat-shrunk and tightened hot shrink tube.The utility model makes grinding fluid permeability zero by heat shrink tube sealing, radically cure intergranular corrosion, simultaneously, realize micro-newton level flexible clamping by heat shrink tube buffer, avoid clamping damage, and pass through the heating mode of spiral heating and end portion reinforcement to guarantee sealing property.

The invention discloses a steel plate, a hot stamping part and a preparation method and application thereof, and belongs to the technical field of alloy materials, the hot stamping part comprises an oxide layer, an alloy layer and a steel matrix, and the alloy layer is located between the oxide layer and the steel matrix; in the alloy layer, the phase proportion of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 80%, and the occurrence frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 1%. In addition, the invention further discloses a steel plate component and a preparation method of the hot stamping part and a hot forming process of the hot stamping part. According to the method, the LME resistance of the Fe content in the alloy layer is improved, meanwhile, the crystal configuration of the plating layer is regulated and controlled, the frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% in the zinc-iron alloy layer is improved, and the corrosion resistance of a hot forming part is considered while the LME resistance is achieved by means of the good intergranular corrosion resistance of the coincidence lattice structure.

The application belongs to the technical field of nickel alloy manufacturing, and particularly relates to a kind of wear-resistant and corrosion-resistant nickel-based alloy material and a preparation method thereof, the nickel-based alloy material is sintered from Ni-Cr-Mo pre-alloy powder, Co powder, Ta powder, rare earth oxide powder, titanium sponge powder and core-shell structure reinforcing phase, the reinforcing phase adopts the core-shell structure of Ni-Mo coated silicon carbide-graphite, which is used to eliminate heterogeneous interface pores and in-situ anchor effectively to prevent particle peeling, and effectively block the malignant outward diffusion of carbon atoms to protect the intergranular corrosion resistance of alloy matrix, the nickel-based alloy material is purified by in-situ deoxidization, carbide interface is anchored effectively, and the corrosion-resistant hardening of core-shell reinforcing phase, a high-bonding composite reinforcement network is built inside, the problem of intergranular corrosion caused by heterogeneous phase peeling and carbon diffusion is solved, and efficient combination of high metallurgical density, lubrication and corrosion resistance is realized.

The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas, and belongs to the field of welding materials. The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas. A flux core of the ultralow-carbon stainless steel flux-cored wire comprises the following components in percentage by weight: 1-8% of Mn; 0.1%-1% of Si; 25 to 40 percent of Cr; 15%-30% of Ni; the total amount of Na2O and K2O is 1-7%; 0-1% of fluoride; 1 to 6 percent of TiO2; 8%-15% of SiO2; 4 to 16 parts of ZrO2; 1 to 5 parts of MnO; and the balance of Fe. And the filling rate of the flux core is 24-32%. According to the flux-cored wire, the problems that an existing stainless steel flux-cored wire is many in weld oxidation color, unattractive in weld joint, difficult in deslagging and poor in gas hole sensitivity are solved, welding is conducted under the condition of 80% Ar + 20% CO2 mixed gas, and deposited metal obtained after welding has the tensile strength larger than or equal to 520 Mpa and the ductility larger than or equal to 25%. As a welding material for dissimilar steel butt joint and low alloy steel surface surfacing, good welding process performance, stable electric arc, no splashing and attractive weld joint forming are guaranteed, and it is guaranteed that welded metal has excellent intergranular corrosion performance.

A kind of Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate welding joint preparation method suitable for low temperature corrosion service environment belongs to the field of welding.It includes the following steps: selecting warm rolling state Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate as base material, matching specific component ER5E61 welding wire; the area to be welded is designed, mechanically polished and "alkali washing-acid washing"; under inert gas protection, using "primer-filling-capping" multi-layer multi-pass welding process, implementing gradient heat input in different passes; after welding, low temperature annealing treatment is carried out.The present application solves the problems of incomplete penetration, pore enrichment and low temperature brittleness during the welding of plate, the internal weld reaches the I level standard, the joint intergranular corrosion nitric acid weight loss value is less than 15mg / cm2, the strength and toughness of the joint at 77K low temperature is improved, the elongation after fracture is greater than or equal to 9.0%, and the fracture mode is changed to mixed fracture dominated by toughness.

This invention relates to the field of stainless steel materials technology, specifically to a nickel-chromium-molybdenum-containing marine splash zone-resistant and corrosion-inhibiting stainless steel material and its preparation process. The chemical composition of the stainless steel material, by mass percentage, includes: carbon ≤0.04%, silicon 0.5%-0.8%, manganese ≤0.8%, phosphorus ≤0.02%, sulfur ≤0.0015%, chromium 22%, nickel 10%-11%, molybdenum 3.0%-3.5%, copper 1.2%-1.5%, titanium 0.2%-0.25%, niobium 0.1%-0.15%, with the remainder being iron. This invention's stainless steel material, through scientific chemical composition design, constructs a stable basic corrosion-resistant system. Simultaneously, the introduction of specific elements exerts a synergistic effect, effectively enhancing the stability and density of the passivation film on the material surface. This significantly improves the material's resistance to pitting corrosion in marine splash zones, reduces the risk of chloride ion damage to the passivation film, effectively inhibits intergranular corrosion, greatly improves the material's corrosion resistance stability, and extends its service life in harsh marine environments.

The utility model belongs to the technical field of metallurgical equipment, particularly relates to material proportioning equipment for austenitic stainless steel intergranular corrosion resistance production, and provides the following scheme aiming at the problems of insufficient proportioning precision and serious impurity residue in the background technology: the material proportioning equipment comprises a bracket, and a double-screw conveyor is arranged on the outer wall of the top of the weighing table. The double-screw conveyor is linked with the weighing platform, the weight of materials is fed back to the PLC electric control cabinet in real time, the conveying speed is dynamically adjusted, and the matching error of key elements such as Cr and Ni is reduced. The design of the material supplementing pipe and the material distributing pipe supports multi-batch trace adding, component fluctuation caused by one-time feeding is avoided, the screen can intercept large-particle impurities, the electromagnetic iron remover adsorbs metal chippings through a high-intensity magnetic field, and the impurity removal rate is increased. And the top tank and the bottom hopper are designed in a split manner, so that the screen and the electromagnetic iron remover are convenient to clean regularly, the maintenance is convenient, and continuous production is not influenced.

Described herein are 6xxx series aluminum alloys which exhibit high corrosion resistance while maintaining high strength-to-weight ratio, formability, and weldability. The 6xxx series aluminum alloys include Cr to improve intergranular corrosion resistance while maintaining high strength and formability. 6xxx series aluminum alloys including Cr in amount from 0.05 wt. % to 0.50 wt. % improved IGC resistance. The Cr addition in 6xxx series aluminum alloys improves the corrosion resistance of aluminum alloy products formed from the aluminum alloy without causing a substantial loss in strength.

The invention belongs to the technical field of microstructure simulation, and provides a method for simulating a local corrosion process of an Al-Cu-Li alloy laser welding joint aiming at the problem that a traditional CA model has defects in simulation of microscopic grain structure characteristics, the CA model is reconstructed on the basis of a Voronoi diagram method and test characterization data, and the local corrosion process of the Al-Cu-Li alloy laser welding joint is simulated. An intermetallic compound is introduced into a model for the first time, a three-dimensional CA model containing seven types of cells and five evolution rules is systematically constructed, and reproduction of local corrosion processes such as grain boundary preferential dissolution and corrosion channel expansion of a fusion region in an acid environment is achieved. Optimization design is carried out on model parameters based on a deep learning training algorithm, and the optimized model well reflects the actual intergranular corrosion morphology of the fusion zone.

The invention discloses an aluminum alloy composite board, a heat exchange tube and a heat exchanger, the aluminum alloy composite board comprises a core material layer, a first composite layer and a second composite layer, the first composite layer and the second composite layer are arranged on the two sides of the core material layer in the thickness direction of the core material layer respectively, and the core material layer comprises, by mass, 1.0-2.0% of Mn, 0.1-1.0% of Fe, 0.1-3.0% of Cu, smaller than or equal to 0.10% of Ce, smaller than or equal to 0.3% of Si, smaller than or equal to 0.1% of Mg, smaller than or equal to 0.5% of P, smaller than or equal to 0.5% of S and the balance Al. The core material layer comprises the following components in percentage by weight: less than or equal to 0.5% of Zn, less than or equal to 0.25% of Zr, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ti and the balance of Al and inevitable impurity elements, and Al-Cu-Ce alloy is formed on the core material layer. According to the aluminum alloy composite board, Ce is introduced into the core material layer, the Ce and Cu have strong interaction, an Al-Cu-Ce alloy is formed, the probability of intergranular corrosion is reduced, and the corrosion resistance of the aluminum alloy composite board is improved.

The invention belongs to the technical field of metal materials, and particularly relates to rare earth-antimony synergistic alloying corrosion-resistant steel special for photovoltaic and a preparation method of the corrosion-resistant steel. The corrosion-resistant steel special for photovoltaic is prepared from, by weight, 0.04%-0.08% of C, 0.20%-0.50% of Si, 0.80%-1.50% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.003% of S, 1.50%-3.00% of Cr, 0.20%-0.50% of Mo, 0.10%-0.40% of Ni, 0.010%-0.030% of RE, 0.05%-0.20% of Sb, 0.02%-0.05% of Als, smaller than or equal to 0.0050% of N and the balance Fe and inevitable impurities. Wherein RE / S satisfies 3.5 < = RE / S < = 5.0, and Sb / Cr satisfies 0.03 < = Sb / Cr < = 0.08; and through a two-stage controlled rolling and controlled cooling process, a core-shell structure with rare earth sulfur oxide as a core and an antimony atom enrichment layer as a shell is formed on the ferrite grain boundary. By the adoption of the technical scheme, the grain boundary electrochemical stability can be improved, pitting corrosion resistance and intergranular corrosion resistance are remarkably enhanced, and meanwhile the excellent comprehensive performance of high strength and high toughness is obtained.

The application discloses a stress corrosion resistant austenitic stainless steel for nuclear power and a manufacturing method thereof. The chemical composition of the steel comprises C: 0.06%-0.10%; Si: 0.85%-1.20%; Mn: 1.65%-2.25%; P≤0.015%; S≤0.005%; Ni: 8.45%-9.55%; Cr: 16.25%-18.45%; Al: 0.80%-1.50%; Mg: 0.002%-0.004%; Nb: 0.015%-0.030%; and Zn: 0.002%-0.005%. The production process of smelting, continuous casting, heating, rolling and heat treatment is combined, the yield strength and tensile strength of the steel plate at room temperature are above 420 MPa and 752 MPa respectively, the yield strength and tensile strength during high-temperature tension at 650 DEG C are above 205 MPa and 412 MPa respectively, and the steel plate has good intergranular corrosion resistance and stress corrosion resistance.

The invention relates to the field of metal material performance testing, in particular to a stainless steel intergranular corrosion testing device and method.The stainless steel intergranular corrosion testing device comprises a reaction kettle, a circular plate is fixedly arranged in the reaction kettle, a plurality of corrosion-resistant containers are arranged above the circular plate, each corrosion-resistant container comprises a supporting bowl and a containing vessel, and the containing vessel is of a double-layer structure; a plurality of through holes are formed in the inner wall of the containing vessel, a plurality of filter grooves are formed in the outer wall of the containing vessel, rotating pipes are rotationally arranged at the bottoms of the supporting bowls, a multi-edge plug is arranged at the bottom of the containing vessel, a driving mechanism is arranged on the circular plate, a transmission mechanism is arranged between the rotating pipes and the circular plate, and a lifting pin is arranged in the containing vessel. Meanwhile, the transmission mechanism can drive the containing vessel to rotate through the rotating pipe, so that the corrosive liquid in the containing vessel continuously flows under the action of double movement, local temperature difference is avoided, measured intergranular corrosion data can more truly reflect the overall performance of the material, and the reliability of a test result is remarkably improved.

The invention provides a non-standard Inconel 718 alloy super-long forged material and a manufacturing method thereof, and the manufacturing method comprises the following steps: preparing an electrode bar through vacuum induction melting, and carrying out electroslag remelting to obtain an electroslag ingot with the diameter of 500 + / -20 mm; carrying out homogenization heat preservation on the electroslag ingot at 1140-1200 DEG C for not less than 120 hours; after being cogged and deformed into square billets, the square billets are forged into round bars with the diameter phi being 180 + / -10 mm and the length being larger than 12000 mm through a high-speed forging machine within the single heating number, and the finish forging temperature is controlled to be larger than or equal to 980 DEG C so as to restrain delta phase precipitation; and then solid solution and aging heat treatment is conducted, the solid solution temperature is 1000 + / -10 DEG C, the aging temperature is 700 + / -10 DEG C, and solid solution for 2-4 hours and aging heat preservation for 6-8 hours are matched to meet the requirement for cross section through burning and structure consistency. The super-long forging material prepared by the method is uniform in chemical component, low in magnification and free of macroscopic defects, carbides in a high-magnification structure are uniformly distributed and free of Laves phases, the room-temperature mechanical property and the intergranular corrosion property can be comprehensively matched, and the method is suitable for manufacturing super-long high-temperature alloy forging materials with non-standard performance requirements.

The invention discloses a preparation method of a battery and the battery, and belongs to the field of battery processing. The preparation method comprises the step of preparing the battery shell by adopting a metal material, wherein the metal material comprises titanium. And performing oxidation treatment on the surface of the battery shell to form a titanium dioxide film on the surface of the battery shell. The battery shell is prepared from the metal material containing titanium, and the titanium has lower density than stainless steel, so that the weight of the battery shell can be reduced. And moreover, as titanium is more excellent in intergranular corrosion, the corrosion resistance is high, and the intergranular corrosion is not easy to occur. And the titanium can still keep good toughness at low temperature, so that the battery shell prepared from the metal material containing the titanium has better low-temperature brittleness. The titanium dioxide film is formed after the surface oxidation treatment of the battery shell, and the corrosion resistance of the shell can be enhanced through the titanium dioxide film.

A bending device for intergranular corrosion samples relates to the field of physical sample preparation and sampling technology for stainless steel intergranular corrosion samples. It includes a bending mechanism with a stamping mechanism fixed to it. The bending mechanism is used for sample placement and positioning, while the stamping mechanism is used for 180-degree bending of the sample. This invention can achieve 180-degree bending sampling with a single pressure operation. During sampling, the stamping head of the stamping mechanism and the stamping groove of the bending mechanism cooperate to bend the sample into a V-shaped structure with an acute angle. The stamping head then positions the sample, and the inwardly moving inner push rods on the bending mechanism further reduce the angle of the sample until a 180-degree bending sampling is achieved. This operation method improves the efficiency of sample bending.

The invention discloses a ladder aluminum alloy material, a preparation method thereof and a ladder, and relates to the technical field of alloy materials. The composition of the aluminum alloy is optimized, the content of Si is slightly increased, it is ensured that the Si fully reacts with Mg and Cu, and free Cu residues are avoided; according to the method, the Fe content is reduced, the Al-Fe-Mn-Cr brittle phase is reduced, Mn and Cr are prevented from being consumed, and the matrix continuity is improved; meanwhile, the content of Cu is increased to a Q phase forming threshold value, the Mg2Si phase is promoted to be partially converted into a stronger Q phase, and the yield strength is improved; the content of Mn and Cr are kept to synergistically refine grains, and meanwhile, the Al6Mn phase of Mn can assist in inhibiting intergranular corrosion; and on the basis of increasing the Cu content, the Mg content is synchronously and slightly increased, and the proportion balance of the Q phase and the Mg2Si phase is ensured. According to the optimized aluminum alloy composition, the tensile strength and the extension strength can be remarkably improved, so that the use requirements of ladders in different scenes are met.

The invention provides a 6-series aluminum alloy wire as well as a preparation method and application thereof, and belongs to the technical field of non-ferrous metal materials. The preparation method of the 6-series aluminum alloy wire comprises the steps of smelting, continuous casting, casting blank scraping, hot rolling, cold drawing, solution treatment and aging treatment. The performance of the aluminum alloy wire is improved by optimizing the composition proportion of the aluminum alloy wire and cooperatively regulating and controlling the process, the conductivity of the wire reaches 56-60% IACS, the tensile strength at the room temperature is 220-250 MPa, the ductility is larger than or equal to 10%, the strength is kept to be larger than or equal to 200 MPa at the temperature of 150 DEG C, the intergranular corrosion depth is smaller than or equal to 150 micrometers, the aluminum alloy wire is suitable for a new energy motor winding, and the weight can be reduced by 30% or above by replacing a copper wire.

The invention discloses a single-crystal magnesium alloy wire for acupoint catgut embedding and weight losing and a preparation method of the single-crystal magnesium alloy wire, the chemical composition expression of the single-crystal magnesium alloy wire is Mg-yM-zR, in the formula, y and z represent the mass fraction of M and the mass fraction of R in magnesium alloy respectively, y is larger than or equal to 1.2 and smaller than or equal to 1.7, z is larger than or equal to 0.3 and smaller than or equal to 0.8, and the balance is Mg; m is one of Sr, Ce and Co, and R is one of Ge, Sm and Dy; the wire is prepared through the processes of smelting and casting, homogenizing treatment, hot extrusion, multi-pass cold drawing, intermediate annealing and zone smelting and directional solidification, and has uniform and controllable degradation rate, excellent mechanical property and biocompatibility; after the catgut embedding slimming agent is embedded into the acupuncture point of a human body, fat metabolism is promoted through mild and lasting physical stimulation and chemical ion regulation, intergranular corrosion and premature fracture caused by a polycrystalline structure are avoided, and the safety and durability of a catgut embedding slimming therapy are improved.

The invention relates to the field of preparation of aluminum alloy materials, and discloses a Mo-containing ultrahigh-strength aluminum alloy wire and a preparation method and application thereof. By optimizing the alloy ratio and the preparation process, the Mo-containing ultrahigh-strength aluminum alloy wire is prepared, and the Mo-containing ultrahigh-strength aluminum alloy wire has the following performance characteristics that (1) the tensile strength is larger than or equal to 440 MPa, and the yield strength is larger than or equal to 400 MPa; the aluminum alloy wire is mainly used for manufacturing ultrahigh-strength 7-series material welding structural parts, has good corrosion resistance and excellent welding performance and machining performance, and can effectively solve the problem that in the prior art, the welding performance, yield strength and corrosion resistance of aluminum alloy cannot be considered at the same time.

The invention provides an intergranular corrosion U-shaped sample preparation device and method. The device comprises a tool cabinet, a pressure head, a power system and a mold assembly. The power system and the mold assembly are arranged on the tool cabinet, the pressure head is connected to the power system, and the pressure and stroke of the pressure head are controlled by the power system; the mold assembly is arranged below the pressure head and is matched with the pressure head above for use, positioning and fixing are carried out in the forming process of the U-shaped sample, the sample is bent into a U shape, and the accuracy of the shape and size of the sample is ensured; the special structure of the mold assembly is used for reserving a certain springback allowance in advance in the forming process of the sample, so that the two arms can be kept parallel finally after springback, and the accuracy of the shape of the U-shaped sample is ensured. By utilizing the sample preparation device, the sample processing precision is ensured, and the working efficiency is high.

The invention discloses a double-ring electrochemical potential reactivation (DL-EPR) intergranular corrosion testing method suitable for high-chromium ultra-pure ferritic stainless steel, and belongs to the technical field of corrosion. The DL-EPR intergranular corrosion testing method which can accurately reflect the sensitization degree of a material and ensure that testing data has good reliability and reproducibility and has good grain boundary corrosion selectivity is developed by preparing a testing solution and adjusting the potential scanning rate and the testing temperature. According to the method, rapid, nondestructive and quantitative evaluation on the intergranular corrosion sensitivity of the high-chromium ultra-pure ferritic stainless steel can be realized.

The invention discloses a heat-resistant and corrosion-resistant nickel-based alloy wide and thick plate for a polycrystalline silicon cold hydrogenation reaction furnace and a manufacturing method. The alloy comprises the following chemical components in percentage by weight: 0.03-0.08% of C, less than or equal to 0.40% of Si, less than or equal to 0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 30.0-36.0% of Fe, 28.0-34.0% of Cr, 0.5-1.0% of Mo, 0.20-0.70% of Nb, 0.20-0.60% of V, 0.15-0.22% of N and the balance of Ni and inevitable impurities. Through reasonable component design and establishment of optimized smelting, annealing, forging, hot rolling and solid solution heat treatment processes, the heat-resistant and corrosion-resistant nickel-based alloy wide and thick plate which is excellent in structure and performance and meets the application requirements of a polycrystalline silicon cold hydrogenation reactor is manufactured, and the heat-resistant and corrosion-resistant nickel-based alloy wide and thick plate has good high-temperature performance and intergranular corrosion resistance.